Dan Foster wrote:
It did, yes. It was 7 MHz, wasn't it? (memory fading.) Apple engineers also reportedly tested the 816 (maybe not necessarily in the MT itself) at much greater speeds, because Dave Lyons had an interesting mention of things holding up reliably to about 16 MHz or so. [I don't recall what the issue was... timing or interrupt handling?]
Every MT was different but all the writeups I've seen said it ran at the same speed as the production IIgs. For instance http://apple2history.org/history/ah11.html#09 Wayne